Lesson 5 - Plant Environment Interactions Signaling Plant Sensory Systems Pigments o Light absorbing molecules o Allow plants to sense the quality and

Lesson 5 - Plant Environment Interactions Signaling Plant...

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Plant Environment Interactions: Signaling Plant Sensory Systems Pigments o Light absorbing molecules o Allow plants to sense the quality and quantity of light Chlorophyll o Green pigment o Primary pigment in photosynthesis o Uses light for energy o Converts light energy to chemical energy Two types of growth responses to light o Photomorphegnesis Non-directional light triggered development o Phototropism Directional growth responses Phytochrome o Pigment that contains protein involved in photomorphegnesis o Uses light for info o Involved in many signaling pathways that lead to gene expression P fr and expression of light-response genes o P r Absorbs red light Found in cytoplasm Converted to P fr when red photons available and enters the nucleus 660 nm biologically inactive o P fr Absorbs far-red light Binds with other proteins that form a transcription complex, leading to expression of light-regulated genes Converted back to P r when far-red photons available 730 nm biologically active o Proteasome Activation of Light Response Genes Kinase domain of P fr
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Growth Responses and Phytochrome Seed germination o Inhibited by far red light Under shade prevents germination
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